一段framebuffer的示例程序（转）--bruce点点滴滴.htm
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<TD class=textbox-title background=""><IMG alt=Diary src=""
align=absMiddle><STRONG>一段framebuffer的示例程序（转）</STRONG><BR>[ bruce
发表于 2006-5-8 22:16:00 ]</TD></TR>
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<TD class=textbox-content><FONT
size=4>比较简单，不过确实可以工作，对演示framebufer的使用方法足够了，呵呵<BR>这是出处：<BR>http://doc.trolltech.com/3.0/emb-framebuffer-howto.html<BR></FONT><PRE><FONT size=4>＃i nclude <unistd.h><BR>＃i nclude <stdio.h><BR>＃i nclude <fcntl.h><BR>＃i nclude <linux/fb.h><BR>＃i nclude <sys/mman.h><BR><BR>int main()<BR>{<BR> int fbfd = 0;<BR> struct fb_var_screeninfo vinfo;<BR> struct fb_fix_screeninfo finfo;<BR> long int screensize = 0;<BR> char *fbp = 0;<BR> int x = 0, y = 0;<BR> long int location = 0;<BR><BR> // Open the file for reading and writing<BR> fbfd = open("/dev/fb0", O_RDWR);<BR> if (!fbfd) {<BR> printf("Error: cannot open framebuffer device.\n");<BR> exit(1);<BR> }<BR> printf("The framebuffer device was opened successfully.\n");<BR><BR> // Get fixed screen information<BR> if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo)) {<BR> printf("Error reading fixed information.\n");<BR> exit(2);<BR> }<BR><BR> // Get variable screen information<BR> if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo)) {<BR> printf("Error reading variable information.\n");<BR> exit(3);<BR> }<BR><BR> printf("%dx%d, %dbpp\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel );<BR><BR> // Figure out the size of the screen in bytes<BR> screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;<BR><BR> // Map the device to memory<BR> fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED,<BR> fbfd, 0);<BR> if ((int)fbp == -1) {<BR> printf("Error: failed to map framebuffer device to memory.\n");<BR> exit(4);<BR> }<BR> printf("The framebuffer device was mapped to memory successfully.\n");<BR><BR> x = 100; y = 100; // Where we are going to put the pixel<BR><BR> // Figure out where in memory to put the pixel<BR> for ( y = 100; y < 300; y++ )<BR> for ( x = 100; x < 300; x++ ) {<BR><BR> location = (x+vinfo.xoffset) * (vinfo.bits_per_pixel/8) +<BR> (y+vinfo.yoffset) * finfo.line_length;<BR><BR> if ( vinfo.bits_per_pixel == 32 ) {<BR> *(fbp + location) = 100; // Some blue<BR> *(fbp + location + 1) = 15+(x-100)/2; // A little green<BR> *(fbp + location + 2) = 200-(y-100)/5; // A lot of red<BR> *(fbp + location + 3) = 0; // No transparency<BR> } else { //assume 16bpp<BR> int b = 10;<BR> int g = (x-100)/6; // A little green<BR> int r = 31-(y-100)/16; // A lot of red<BR> unsigned short int t = r<<11 | g << 5 | b;<BR> *((unsigned short int*)(fbp + location)) = t;<BR> }<BR><BR> }<BR> munmap(fbp, screensize);<BR> close(fbfd);<BR> return 0;<BR>}</FONT></PRE><BR><BR><BR><BR><IMG
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